2 * Cirrus Logic AccuPak (CLJR) codec
3 * Copyright (c) 2003 Alex Beregszaszi
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Cirrus Logic AccuPak codec.
31 typedef struct CLJRContext {
32 AVCodecContext *avctx;
36 static av_cold int common_init(AVCodecContext *avctx)
38 CLJRContext * const a = avctx->priv_data;
40 avcodec_get_frame_defaults(&a->picture);
41 avctx->coded_frame = &a->picture;
47 #if CONFIG_CLJR_DECODER
48 static int decode_frame(AVCodecContext *avctx,
49 void *data, int *data_size,
52 const uint8_t *buf = avpkt->data;
53 int buf_size = avpkt->size;
54 CLJRContext * const a = avctx->priv_data;
56 AVFrame *picture = data;
57 AVFrame * const p = &a->picture;
61 avctx->release_buffer(avctx, p);
63 if (buf_size / avctx->height < avctx->width) {
64 av_log(avctx, AV_LOG_ERROR,
65 "Resolution larger than buffer size. Invalid header?\n");
66 return AVERROR_INVALIDDATA;
70 if (avctx->get_buffer(avctx, p) < 0) {
71 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
74 p->pict_type = AV_PICTURE_TYPE_I;
77 init_get_bits(&gb, buf, buf_size * 8);
79 for (y = 0; y < avctx->height; y++) {
80 uint8_t *luma = &a->picture.data[0][y * a->picture.linesize[0]];
81 uint8_t *cb = &a->picture.data[1][y * a->picture.linesize[1]];
82 uint8_t *cr = &a->picture.data[2][y * a->picture.linesize[2]];
83 for (x = 0; x < avctx->width; x += 4) {
84 luma[3] = get_bits(&gb, 5) << 3;
85 luma[2] = get_bits(&gb, 5) << 3;
86 luma[1] = get_bits(&gb, 5) << 3;
87 luma[0] = get_bits(&gb, 5) << 3;
89 *(cb++) = get_bits(&gb, 6) << 2;
90 *(cr++) = get_bits(&gb, 6) << 2;
94 *picture = a->picture;
95 *data_size = sizeof(AVPicture);
100 static av_cold int decode_init(AVCodecContext *avctx)
102 avctx->pix_fmt = PIX_FMT_YUV411P;
103 return common_init(avctx);
106 static av_cold int decode_end(AVCodecContext *avctx)
108 CLJRContext *a = avctx->priv_data;
110 if (a->picture.data[0])
111 avctx->release_buffer(avctx, &a->picture);
115 AVCodec ff_cljr_decoder = {
117 .type = AVMEDIA_TYPE_VIDEO,
119 .priv_data_size = sizeof(CLJRContext),
122 .decode = decode_frame,
123 .capabilities = CODEC_CAP_DR1,
124 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),
128 #if CONFIG_CLJR_ENCODER
129 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
130 int buf_size, void *data)
135 uint32_t dither= avctx->frame_number;
137 p->pict_type = AV_PICTURE_TYPE_I;
140 init_put_bits(&pb, buf, buf_size / 8);
142 for (y = 0; y < avctx->height; y++) {
143 uint8_t *luma = &p->data[0][y * p->linesize[0]];
144 uint8_t *cb = &p->data[1][y * p->linesize[1]];
145 uint8_t *cr = &p->data[2][y * p->linesize[2]];
146 for (x = 0; x < avctx->width; x += 4) {
147 put_bits(&pb, 5, (luma[3] + (dither>>29) ) >> 3);
148 put_bits(&pb, 5, (luma[2] + ((dither>>26)&7)) >> 3);
149 put_bits(&pb, 5, (luma[1] + ((dither>>23)&7)) >> 3);
150 put_bits(&pb, 5, (luma[0] + ((dither>>20)&7)) >> 3);
152 put_bits(&pb, 6, (*(cb++) + ((dither>>18)&3)) >> 2);
153 put_bits(&pb, 6, (*(cr++) + ((dither>>16)&3)) >> 2);
154 dither = dither*1664525+1013904223;
160 return put_bits_count(&pb) / 8;
163 AVCodec ff_cljr_encoder = {
165 .type = AVMEDIA_TYPE_VIDEO,
167 .priv_data_size = sizeof(CLJRContext),
169 .encode = encode_frame,
170 .pix_fmts = (const enum PixelFormat[]) { PIX_FMT_YUV411P,
172 .long_name = NULL_IF_CONFIG_SMALL("Cirrus Logic AccuPak"),